theyre ok, towards good since a little while ago. never been stellar, never been crap.

edit : nope, thats not off topic. higher end cards wil ltake a bigger hit, and of course raising resolution will have an impact too. so yes, there will be a hit vs 16x x2 and 8x x2. how big? could be enough to take away your minimum 30 fps or maybe 70 fps vs 80 fps on other titles. try it out